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Income Taxes - Difference Between the Effective Tax Rate and the U.S. Federal Statutory Income Tax Rate (Detail) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
Income tax expense at the U.S. federal tax rate | 21.00% | 21.00% | 21.00%
Foreign income tax differential | (20.80%) | (49.20%) | 2.10%
U.S. tax on foreign earnings | (16.70%) | (8.40%) | 2.00%
State and local income taxes | 25.00% | 58.20% | (25.00%)
U.S. permanent book/tax differences | (4.20%) | (17.00%) | (2.70%)
U.S. research and development tax credits | 25.00% | 68.50% | (29.50%)
Change in valuation allowance | (25.00%) | (49.10%) | 27.70%
Tax impact of NOL carry-back under the CARES act. | 0.792 | 0 | 0
Tax impact of equity compensation | (66.70%) | (49.30%) | (1.40%)
Deferred tax impact from intra-entity IP transfer | 6.542 | 0 | 0
Tax impact of U.S. Tax Reform/Transition Tax | 0 | 0 | (0.239)
Tax Impact of uncertain tax positions | (29.20%) | (24.60%) | 20.20%
Other, net | (4.30%) | (3.90%) | (1.60%)
Effective income tax rate | 637.50% | (53.80%) | (11.10%)

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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